copy should only happen if acinclude.m4 doesn't exist

Signed-off-by: Radu Moisan <[email protected]>
---
 .../recipes-sato/rxvt-unicode/rxvt-unicode_9.18.bb |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/meta/recipes-sato/rxvt-unicode/rxvt-unicode_9.18.bb 
b/meta/recipes-sato/rxvt-unicode/rxvt-unicode_9.18.bb
index 9a47617..e417957 100644
--- a/meta/recipes-sato/rxvt-unicode/rxvt-unicode_9.18.bb
+++ b/meta/recipes-sato/rxvt-unicode/rxvt-unicode_9.18.bb
@@ -42,7 +42,9 @@ EXTRA_OECONF = "--enable-menubar --enable-xim \
                --with-x=${STAGING_DIR_HOST}${prefix}"
 
 do_configure_prepend () {
-       cp ${S}/aclocal.m4 ${S}/acinclude.m4
+       if [ ! -e ${S}/acinclude.m4 ]; then
+               cp ${S}/aclocal.m4 ${S}/acinclude.m4
+       fi
 }
 
 do_compile_prepend () {
-- 
1.7.9.5

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